Secondary battery.



Patented July 24, |900.. D. TDMMASI.

SECONDARY BATTERY.

(Application filed July B, 1899.)

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No. 654,557. Patented lulyv 24, IQII.v

D. T'OMMA-Sl.

sEcuNDARY BATTERY.

(Application led July 8, 1899.)

(No Modal.) 3 Sheets-Shet 2.

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(Application led July 8, 1899.)

(No Model.) 3 Sheets-Sheet 3.

UnirrEn STATES PATENT @Enron DONATO rrOMMAsr, on Panis, FRANCE;

SECONDARY BATTERY.

SPECIFICATION forming part of Letters Patent No. 654,557, dated July 24,ieof. lApplication tiled July 8, 1899. Serial No. 728,157. (No mcl'el.)

To @ZZ whom it may coli/cern,.-

Be it known that I, DONATO Toi/inner, engineer, of 6 Rue des ImmeublesIndustriels, in the city of Paris, Republic of France, have inventedImprovements in Secondary Batteries, of which the following is a full,clear,

My improved electrode is formed, essen-V tially, of a spirally-wcundmetallic strip, be-

tween the convolutions of which the active material is retained, thisstrip being composed of a resilient metal, antimony-lead or othersuitable alloy of lead, or of a strip of steel, copper, bronze, the.,coated with lead. In order to render the coil unattackable by theelectrolyte, it is coated with a composition consisting of a mixture ofcollodion and a sufiicient quantity of platinum-black, peroxid ofcobalt, binoxid of manganese, or other substance conductive ofelectricity to constitute a conductive mass unattackable by the liquid yused as the electrolyte. I may also coat the completed electrode withthe same composition for the purpose of increasing the oohesion of itsconstitutive elements.

The accumulator-electrode of this invention is further characterized bythe special composition of the active material, which consists of oxidof lead mixed with a certain proportion (about iive per cent.) of oxidof cobalt or binoxid of manganese. The addition of oXid of cobalt or ofbinoxid of manganese has the effect of rendering the charging morerapid, more intense, and more regular.

Reference is to be had to the accompanying drawings, forming part ofthis specification, wherein-- Figure l represents an elevation, partlyin section,of an accumulator. Fig. 2 is acrosssectionf of the same online A B, Fig. l. Fig. 3 is a perspective view of an accumulator. Fig. 4is a vertical section of anV electrode, and Fig. 5 a perspective view ofthe same. Figs. 6 and 7 show aface view and transverse Vertical sectionof a cathode adapted for use in conjunction with the improved electrodeemployed as anode. Figs. S and 9 show a face view and transversevertical' section of a mod ication of this cathode. Fig'. 10 shows atransverse vertical section of another modi# iication of the cathode.

The same letters of reference denote like parts in all the figures.

In Figs. l, 4, and 5 I have shown the ele; ment in its expandedcondition.

In this improved accumulator each electrode, and particularly eachpositive plate, is constituted by a spirally-wo und metallic strip c,between the coils of which the active material Zi is retained. rIhestrip ct would be made of a resilient metal-#for instance, ofantimony-lead or other sufficiently-resilient alloy of lead-or it mightbe constituted of a strip of steel, copper, bronze, &'c., coated withlead, or it may be made by passing leadcoated wire used for telegraphicpurposes between rolls. This metallic strip may be of 'any suitablesection--for example, it may be flat, of I form, or be grooved orcorrugated or ribbed for the purpose of better retaining the activematerial. The latter may also be retained laterally by means oicrossarms. Each strip a is fixed at one end to a central boss c, ofinsulating material, and is contained within a rim d, also of insulatingmaterial, which has a slot in it for the passage of the outer extremityof the strip ct. The electrodes thus constituted are all mountedvertically upon the same horizontal shaft e and are immersed in theliquid electrolyte contained in a trough j. In order to preserve acertain interval between the electrodes, the rimsd are formed withlateral distance pieces or projections g, (see Fig. 5,) which abuttogether, so as to permit of the electrolyte circulating freely betweenthe electrodes and also of clamping them together, so as to prevent anyrelative change of position. The set of elec IOO trodes may be mountedwithin the trough f in any suitable manner, as in Fig. l, which willprevent shifting in the event of the accumulator being subjected toshock or concussion, so as to render the accumulator especially suitablefor use on motor-vehicles. All the ends of the strips of the positiveplates are connected to the same positive conducting-rod h, and the endsof the strips of the negative plates are connected to the same negativeconducting-rod t'.

The hereinbeforedescribed construction of electrode may be employed bothfor positive and negative electrodes or for positive electrodes only, inwhich case the negative electrode would be preferably constituted asshown in Figs. 6 and 7. In this case the frame of the negative electrodeis made of a flanged diskj, of carbon, presenting on both faces studs orprojections andon its internal circumference corrugations for thepurpose of retaining the active material.

In Figs. 8 and 9 the negative electrode is shown as formed of a metaldisk 7c, mounted on an insulating-core and encircled by a rim, also ofinsulating material or of conductive material unattackable by theelectrolyte. The negative electrode may also be constructed, as shown inFig. lO, of a flanged disk l, of insulating material, each face of whichis covered by a metallic disk m, upon which the active material isapplied and retained by any suitable non-conducting means-such ascross-arms, for example.

The active material for the positive electrodes is composed of oXid oflead mixed with a suitable proportion (about five per cent.) of oxid ofcobalt or binoXid of manganese. This composition may be made either bymechanically mixing in the proper proportions oXid of lead and oXid ofcobalt or binoxid of man ganese or by electrolyzing a salt of cobalt orof'manganese with anodes formed of oXid of lead in such manner as todeposit the oxidof cobalt or binoXid of manganese in the mass of oXid oflead.

In my system of accumulators the electrolyte contains, preferably, acertain proportion of salts of cobalt or of manganese capable offurnishing under the action of the current peroxid of cobalt or ofmanganese, with the object of always .maintaining in the active materialthe same quantity of oXid of cobalt or of binoXid of manganese.

The active material of the negative electrodes is constituted,preferably, by mixing oXid of lead or spongy lead with a suitablequantity of crushed carbon or graphite.

It is to be understood that the accumulator-plates of this invention maybe varied in form and dimensions and that I may modify the accessoryarrangements and mode of mounting to suit different applications.

I claiml. An' electrode for electric accumulators' comprising aspirally-wound resilient metallic strip or support for the activematerial having the active material supported by and retained betweenthe convolutions thereof, one end of said strip being freely movable,whereby the strip may accommodate itself to the expansions orcontractions of the active material in charging and discharging, andmeans for supporting the coiled strip in a vessel in such a way as topermit it to expand and contract.

2. An electrode for electric accumulators comprising a spirally-woundelastic lead-containing strip covered with an electrical conductingmaterial which is free from attack by the electrolyte and having theactive material supported byand retained between the convolutionsthereof, one end of said strip being freely movable, whereby the stripmay accommodate itself to the expansions or contractions of the activematerial in charging and discharging.

3. An electrode for electric accumulators comprising a spirally-woundelastic metallic strip covered with a composition of collodion andplatinum-black andA having the active material supported by and retainedbetween the convolutions thereof, one end of said strip being freelymovable, whereby the strip may accommodate itself to the expansions orcontractions of the acti ve material in charging and discharging.

The foregoing specification of my improvements in secondary batteriessigned by me this 22d day of June, 1899.

DONATO TOMMASI.

Witnesses:

EDWARD P. MACLEAN, MAURICE HENRI PIGNET.

